Are you asking how to replace the entire headlight assembly -OR- how to replace just the headlight bulb? Just the bulb.
autozone.com repair info
There are 4 screws that hold it on.
How do you replace a 1999 Ford Escort headlight bulb?"
You can not replace it unless it's an old ford focus.
How do you replace a 1999 Ford Escort headlight - could use a picture.
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On the left, by the left headlight.
Change headlight 1997 ford van